package com.hmdp.service.impl;

import cn.hutool.db.sql.Order;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherMapper;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWork;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import lombok.experimental.Accessors;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service

public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Autowired
    private ISeckillVoucherService seckillVoucherService;
    @Autowired
    private RedisIdWork redisIdWork;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result seckillVoucher(Long voucherId) {
        //1.查询优惠卷
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        //2.判断秒杀是否开始
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀尚未开始");
        }
        //3.判断秒杀是否结束
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已经结束");
        }
        //判断是否购买
        //4.判断库存是否充足
        if (voucher.getStock() < 1 ) {
            return Result.fail("库存不足");
        }

        Long userId = UserHolder.getUser().getId();

        SimpleRedisLock lock = new SimpleRedisLock("order:" + userId, stringRedisTemplate);
        boolean isLock = lock.tryLock(1500);
        if (!isLock) {
            return Result.fail("不允许重复下单");
        }
        try {
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.creatVoucherOrder(voucherId);
        } finally {
            lock.unlock();
        }

    }

    @Transactional
    public Result creatVoucherOrder(Long voucherId) {
        Long userId = UserHolder.getUser().getId();
            int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
            if (count > 0) {
                return Result.fail("不能重复购买");
            }
            //5.扣减库存
            Boolean success = seckillVoucherService.update()
                    .setSql("stock = stock - 1")
                    .eq("voucher_id", voucherId).gt("stock", 0)
                    .update();
            if (!success) {
                return Result.fail("库存不足");
            }
            //6.创建订单
            VoucherOrder voucherOrder = new VoucherOrder();
            Long orderId = redisIdWork.nextId("order");
            voucherOrder.setVoucherId(voucherId);
            voucherOrder.setId(orderId);
            voucherOrder.setUserId(userId);
            save(voucherOrder);
            //7.返回订单id
            return Result.ok(orderId);
    }

}
